The effect of different cathode strategies (mullite/MnO2, Plexiglas/Gore-Tex/MnO2, mullite/coal fly ash, mullite/biochar, mullite/activated carbon) on the performance air-cathode microbial fuel cells (MFCs) was investigated. highest maximum power output observed using MnO2 catalyst pasted Gore-Tex cloth (7.7 mW/m3), yet coulombic efficiencies (CEs) were achieved (CE 23.5 ± 2.7%) and coal ash 20...

A series of FeOx-MnO2-CeO2 catalysts were synthesized by the surfactant-templated coprecipitation method and applied for HCHO removal. The influence Fe/Mn/Ce molar ratio on catalytic performance was investigated, catalyst exhibited excellent activity, with complete conversion at low temperatures (40 °C) when 2/5/5. characterized N2 adsorption desorption, XRD, H2-TPR, O2-TPD XPS techniques to il...

Manganese dioxide (MnO2)-based nanostructures are promising electrode materials for supercapacitors (SCs) due to their low cost, eco-friendly nature, and high theoretical capacitance. However, the conductivity of MnO2 is poor, which a big problem when trying achieve desired capacitance value. Herein, hexagonal-phase nanoparticles (NPs) directly grown on 3D conductive carbon cloth (CC) (denoted ...

In this era, most technology requires electronic equipment. The performance of equipment may be affected by energy storage components like a supercapacitor, so the development supercapacitor electrode materials using green chemical methods needs to pursued. Material with good specific capacitance is MnO2. Most MnO2 synthesis are not based on chemistry, there an alternative method. One them util...

Water pollution with dye effluents from different industries is a broadly established environmental and health problem that needs serious attention. In this study, making use of Acacia nilotica seed extract, greenly synthesized MnO2 nanoparticles were loaded on the surface biochar derived palm waste (MnO2/PF), specific areas 70.97 m2/g. Batch experiments adopted, aiming to evaluate performance ...

In this scientific research, MnO2 nanoparticles (NPs) have been successfully prepared by a precipitation method using KMnO4, MnSO4.H2O and H2O2 (30%) as the precursors. As-prepared sample was identified by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and Infrared (IR) techniques. The transmission electron microscopy (TEM) showed 7-8 nm rang...

Here we demonstrate a controlled two-step partial exfoliation method to synthesize functionalized exfoliated graphite substrates. Ultrathin and functionalized graphene sheets anchoring on the graphite provide a large conductive surface area for loading pseudo-capacitive MnO2 nanosheets. The functionalized exfoliated graphite/MnO2 electrode achieved an excellent areal capacitance of 244 mF cm(-2...

Herein, a general strategy is proposed to boost the energy storage capability of pseudocapacitive materials (i.e., MnO2) to their theoretical limits in unconventional 1D fiber configuration by rationally designing bicontinuous porous Ni skeleton@metal wire "sheath-core" metallic scaffold as a versatile host. As a proof of concept, the 1D metallic scaffold supported-MnO2 fiber electrode is demon...

Cells of Leptothrix discophora SS1 released Mn2+-oxidizing factors into the medium during growth in batch culture. Manganese was optimally oxidized when the medium was buffered with HEPES (N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid) at pH 7.5. Manganese-oxidizing activity in the culture medium in which this strain had been grown previously was sensitive to heat, phosphate, Tris, NaN3, ...

Transition metal oxides are a class of materials that are vitally important for developing new materials with functionality and smartness. The unique properties of these materials are related to the presence of elements with mixed valences. The measurement of cation valence states can be performed using X-ray photoelectron spectroscopy and other chemical techniques, but these techniques are sui...